Effect of Intercritical Annealing Time on the Microstructures and Tensile Properties of a High Strength TRIP Steel

• Published in: Acta metallurgica sinica : English letters Vol. 27; no. 3; pp. 457 - 463
• Main Authors: Wang, Chao, Ding, Hua, Zhang, Jun, Wu, Hongyan
• Format: Journal Article
• Language: English
• Published: Heidelberg The Chinese Society for Metals 01.06.2014; Springer Nature B.V
• Subjects: Annealing; Bainite; Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cold; Corrosion and Coatings; Ductility; Electron probe microanalysis; Electron probes; Elongation; Heat treatment; Investigations; Islands; Materials Science; Mechanical properties; Metallic Materials; Microstructure; Nanotechnology; Organometallic Chemistry; Partitioning; Precipitates; Retained austenite; Scanning electron microscopy; Spectroscopy/Spectrometry; Spectrum analysis; Steel; Steels; Tensile properties; Tensile strength; Tomography; Tribology; TRIP steels; TRIP钢; Volume fraction; 两相区; 体积分数; 实验证据; 拉伸性能; 显微组织; 退火时间; 高强度; Intercritical annealing; TRIP steel; Retained austenite; Stability; Carbon partitioning
• ISSN: 1006-7191; 2194-1289
• DOI: 10.1007/s40195-014-0061-3

A new Mn-Si-Al-Mo-Nb transformation-induced plasticity steel was annealed by intercritical annealing for different durations to investigate the partitioning of C element and the volume fraction change of the microstructural constituents. Direct experimental evidence confirms the partitioning of C elements in different phases during heat treatment by Electron probe microanalysis and X ray diffraction. The distribution of the precipitates was investigated as well. It was revealed that the microstructures and mechanical properties of the investigated steels were affected by the intercritical annealing time. According to the present experiment, the volume fraction of retained austenite and the product of tensile strength and total elongation of investigated steel decrease with increasing intercritical annealing time. It was observed that high tensile strength of 1,103 MPa, total elongation of 21.3%, and strength-ductility product of 23,493.9 MPa % could be successfully produced in this experimental steel at intercritical annealing temperature of 830 ℃, holding for 1 min, and isothermal bainite treatment of 440 ℃ for 5 min holding time.